- Accurate and Large Range: TDS meter measures 0 to 9990 ppm for versatile use. Ideal for testing water in aquariums, pools, and more, with readings up to 9990 ppm clearly displayed. - Intelligent Lock Feature: One-key lock provides stable readings; press and hold to secure the value. Automatic 5-minute shutdown helps prolong battery life. - Professional Water Quality Analysis: Measures total dissolved solids; higher values indicate more impurities in water. Simplifies water quality assessment for healthier drinking water. - Easy and Durable Testing: One-button operation enables quick and accurate 3-second testing. Design can handle tens of thousands of tests. Clear display for easy data reading. - Use Scenarios: - Aquarium maintenance: test tap or RO water to ensure appropriate TDS before mixing with tank water. - Pool or spa care: monitor TDS to decide when to refresh water or adjust filtration. - Drinking water checks: evaluate tap or filtered water to determine if further filtration is needed.